The film and drama will both star Ryūsei Yokohama as Sōta, and Risaki Matsukaze as Mai.
The live-action drama will premiere in March, and the film will premiere this spring.
Akagawara first published the manga as a one-shot in Hakusensha’s The Hana to Yume magazine in January 2015 before launching it as a series in Hana to Yume that May.
Hakusensha’s official website for Modomu Akagawara’s Anitomo (My Brother’s Friend) manga announced on Friday that the manga also has a live-action drama adaptation in the works in addition to the previously announced live-action film.